Although Leon Washington will miss the remainder of the season after fracturing his fibula during the Jets' Sunday afternoon victory over the Raiders, if the injury ends up being strictly a fractured fibula, Washington should be able to continue his career without a dramatic loss of ability.
The most comparable player to Washington to fracture his fibula is Chargers halfback Darren Sproles, who did so in 2006. Sproles missed that season, but came back and has retained his speed while emerging as a dynamic halfback and returner.
Other halfbacks have returned from a fractured fibula to enjoy success, almost immediately. Dorsey Levens, Derrick Ward, and Ricky Williams each rushed for more than 1000 yards in the season following their injury. Willie Parker fractured his fibula in the 2007 season, and while he wasn't particularly effective during the 2008 season, some of that was due to new injuries and a middling offensive line.
In our injury database, there's no halfback that saw his role dramatically decline because of a fibula injury. Washington's injury was gruesome, and it might cost him his chance at a long-term deal for this season, but an aggressive team looking for a bargain next season could do worse than ringing Washington up this spring.